7942978231 has 4 divisors (see below), whose sum is σ = 7956373392. Its totient is φ = 7929583072.

The previous prime is 7942978213. The next prime is 7942978247. The reversal of 7942978231 is 1328792497.

7942978231 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1328792497 = 401 ⋅3313697.

It is a cyclic number.

It is not a de Polignac number, because 7942978231 - 2¹¹ = 7942976183 is a prime.

It is a super-2 number, since 2×7942978231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7942978261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6696691 + ... + 6697876.

It is an arithmetic number, because the mean of its divisors is an integer number (1989093348).

Almost surely, 2^7942978231 is an apocalyptic number.

7942978231 is a deficient number, since it is larger than the sum of its proper divisors (13395161).

7942978231 is a wasteful number, since it uses less digits than its factorization.

7942978231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13395160.

The product of its digits is 1524096, while the sum is 52.

The square root of 7942978231 is about 89123.3876768607. The cubic root of 7942978231 is about 1995.2368511284.

The spelling of 7942978231 in words is "seven billion, nine hundred forty-two million, nine hundred seventy-eight thousand, two hundred thirty-one".